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Every odd number. Multiplying two even numbers gives an even number. Multiplying an odd and an even number gives an even number. Multiplying two odd numbers gives an odd number.
Adding two negative numbers always gives a negative number.
20
That is because 1 is the identity element of numbers with respect to multiplication.
A negative number multiplied by a negative number gives a positive product. EXAMPLE : Find the value of (-3) x (-4) -3 x (4 - 4) = -3 x 0 = 0....expanding the brackets gives -3 x 4 + (-3) x (-4) = 0 -12 + (-3) x (-4) = 0 Therefore (-3) x (-4) = 12 which is a positive number